Communication system, communication apparatus, and communication method

Abstract

There is provided a communication apparatus including a hardware processor configured to: count numbers of transmissions and receptions of a measurement frame assigned between frames when a communication of an active system is performed, by an active system counter, count numbers of transmissions and receptions of the measurement frame when a communication of a standby system is performed, assign switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted to other communication apparatus, and measure a data loss based on a count value of the active system counter or the standby system counter, by excluding frames transferred during a period of time from a transmission of the switchover indication information to a reception of the reception indication information transmitted from the other communication apparatus which has received the switchover indication information, from a measurement target.

What is claimed is: 
     
         1 . A communication system comprising:
 a first communication apparatus capable of performing a switchover of a communication path from an active system to a standby system, and configured to include a first hardware processor configured to:   count a number of transmissions and a number of receptions of a measurement frame assigned between frames transferred on the communication path when a communication of the active system is performed, by an active system counter,   count the number of transmissions and the number of receptions of the measurement frame when a communication of the standby system is performed, by a standby system counter,   measure a data loss based on a count value of the active system counter or the standby system counter, and   assign switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted; and   a second communication apparatus capable of performing a switchover of a communication path from an active system to a standby system, and configured to include a second hardware processor configured to:   assign reception indication information for indicating a reception of the switchover indication information, to a measurement frame to be transmitted to the first communication apparatus according to reception, from the first communication apparatus, of the measurement frame to which the switchover indication information is assigned,   wherein the first hardware processor measures the data loss by excluding frames which are transferred during a period of time from a transmission of the switchover indication information to a reception of the reception indication information, from a measurement target.   
     
     
         2 . The communication system according to  claim 1 ,
 wherein each of the active system counter and the standby system counter includes:   a transmission counter configured to count the number of transmissions of the measurement frame to be transmitted to the second communication apparatus, and   a reception counter configured to count the number of receptions of the measurement frame received from the second communication apparatus, and   wherein the first hardware processor measures the data loss based on a count value of the transmission counter and a count value of the reception counter.   
     
     
         3 . The communication system according to  claim 2 ,
 wherein the first hardware processor:   initializes the count value of the transmission counter when the switchover indication information is assigned to the measurement frame to be transmitted to the second communication apparatus, and   initializes the count value of the reception counter when the reception indication information is assigned to the measurement frame received from the second communication apparatus.   
     
     
         4 . The communication system according to  claim 1 ,
 wherein the second hardware processor is further configured to update a format of the measurement frame to be transmitted to the first communication apparatus according to a format of the measurement frame received from the first communication apparatus, and   the second hardware processor assigns the reception indication information to the measurement frame of the updated format in a case where the switchover indication information is assigned to the measurement frame received from the first transmission apparatus.   
     
     
         5 . A communication apparatus capable of performing a switchover of a communication path from an active system to a standby system, the communication apparatus comprising:
 a hardware processor configured to:   count a number of transmissions and a number of receptions of a measurement frame assigned between frames transferred on the communication path when a communication of the active system is performed, by an active system counter,   count a number of transmissions and a number of receptions of the measurement frame when a communication of the standby system is performed,   assign switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted to other communication apparatus, and   measure a data loss based on a count value of the active system counter or the standby system counter, by excluding frames which are transferred during a period of time from a transmission of the switchover indication information to a reception of the reception indication information transmitted from the other communication apparatus which has received the switchover indication information, from a measurement target.   
     
     
         6 . The communication apparatus according to  claim 5 ,
 wherein each of the active system counter and the standby system counter includes:   a transmission counter configured to count the number of transmissions of the measurement frame to be transmitted to the other communication apparatus, and   a reception counter configured to count the number of receptions of the measurement frame received from the other communication apparatus, and   wherein the first hardware processor measures the data loss based on a count value of the transmission counter and a count value of the reception counter.   
     
     
         7 . The communication apparatus according to  claim 6 ,
 wherein the first hardware processor:   initializes the count value of the transmission counter when the switchover indication information is assigned to the measurement frame to be transmitted to the other communication apparatus, and   initializes the count value of the reception counter when the reception indication information is assigned to the measurement frame received from the other communication apparatus.   
     
     
         8 . A communication method in a communication system provided with a first communication apparatus and a second communication apparatus each capable of performing a switchover of a communication path from an active system to a standby system, the communication method comprising:
 counting a number of transmissions and a number of receptions of a measurement frame assigned between frames transferred on the communication path when a communication of the active system is performed, by an active system counter of the first communication apparatus;   counting the number of transmissions and the number of receptions of the measurement frame when a communication of the standby system is performed, by a standby system counter of the first communication apparatus;   assigning switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted to the second communication apparatus, by the first communication apparatus;   assigning reception indication information for indicating a reception of the switchover indication information, to a measurement frame to be transmitted to the first communication apparatus according to reception, from the first communication apparatus, of the measurement frame to which the switchover indication information is assigned, by the second communication apparatus; and   measuring a data loss based on a count value of the active system counter or the standby system counter, by excluding frames which are transferred during a period of time from a transmission of the switchover indication information to a reception of the reception indication information transmitted from the second communication apparatus which has received the switchover indication information, from a measurement target.   
     
     
         9 . The communication method according to  claim 8 , further comprising:
 counting the number of transmissions of the measurement frame to be transmitted to the second communication apparatus, by a transmission counter included in each of the active system counter and the standby system counter in the first communication apparatus;   counting the number of receptions of the measurement frame received from the second communication apparatus, by a reception counter included in each of the active system counter and the standby system counter in the first communication apparatus; and   measuring the data loss based on a count value of the transmission counter and a count value of the reception counter of the first communication apparatus.   
     
     
         10 . The communication method according to  claim 9 , further comprising:
 initializing the count value of the transmission counter, by the first communication apparatus, when the switchover indication information is assigned to the measurement frame to be transmitted to the second communication apparatus; and   initializing the count value of the reception counter, by the first communication apparatus, when the reception indication information is assigned to the measurement frame received from the second communication apparatus.   
     
     
         11 . The communication method according to  claim 8 , further comprising:
 updating a format of the measurement frame to be transmitted to the first communication apparatus according to a format of the measurement frame received from the first communication apparatus, by the second communication apparatus; and   assigning the reception indication information to the measurement frame of the updated format in a case where the switchover indication information is assigned to the measurement frame received from the first transmission apparatus, by the second communication apparatus.